Originally Posted by
RossMosh
ACM cuts very easily so any cutter will do. If you're cutting with an up cut, put the good side down to the spoil board.
I use a lot of 1/8" bits because they are cheap and work just fine. I haven't noticed any real difference between o flute and 2 flute bits, but o flutes are theoretically better bit. I run the machine anywhere from 60-120ipm. RPM varies with the type of cutter I'm using and travel speed but it's typically between 13000-18000rpm. Speed varies based on what I'm cutting. As you'd guess, bigger = faster. Smaller = slower. I use "disposable" bits to avoid having to clean up the burr. A brand new sharp bit shouldn't leave a burr but burr develops after only a few sheets in my experience. The best bit I've ever used for this type of cutting is Onsrud 63-604. Really good bit for aluminum and ACM. Leaves a really smooth finish on aluminum in particular.
I'm sure you've already cut it, but I'd slow the machine down. That's a little fast.